Rb-Sr, U-Pb, K-Ar Geochronologic Study of the Condrey Mountain Schist, Klamath Mountains, Northern California and Southwestern Oregon

加利福尼亚州北部和俄勒冈州西南部康德雷山片岩、克拉马斯山脉的 Rb-Sr、U-Pb、K-Ar 年代学研究

• 批准号: 8709333
• 负责人: Mark Helper
• 金额: $ 8万
• 依托单位: University of Texas at Austin
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1987
• 资助国家: 美国
• 起止时间: 1987-07-15 至 1989-12-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=8709333&HistoricalAwards=false
• 关键词: Rb; Sr; Pb; Ar; Geochronologic

The Klamath Mountains are an arcuate structural province of Ordovician to Late Jurassic oceanic - and island arc - affinity rocks that were accreted to the western margin of North America during Mesozoic plate convergence. However, the actual tectonic processes during accretion are not well established. Recent work has suggested that parts of the Condrey Mountain Schist exposed in the north-central Klamath Mountains may be an eastward continuation of the Franciscan Complex. If confirmed, this would indicate that the Klamath rocks have been thrust about 100 km over the Franciscan Complex along shallow faults. This project will provide geochronologic, petrologic and isotopic data to more firmly establish the Condrey Mountain - Franciscan correlation and to allow a more detailed account of the accretion processes involved.

克拉马斯山是奥陶纪的一个弧形构造区 到晚侏罗世的大洋和岛弧岩石， 在中生代板块运动期间， 收敛然而，在加积过程中的实际构造过程是 没有很好地建立。 最近的研究表明， 出露于克拉马斯山脉中北部的康尼沃山片岩 可能是方济各会建筑群向东的延续。 如果 这将表明克拉马斯岩石被逆冲 沿沿着浅断层在Franciscan Complex上方约100 km处。 这 该项目将提供地质年代学、岩石学和同位素数据， 更坚定地建立康提山-方济各会的相关性， 以便对所涉及的吸积过程进行更详细的描述。